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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        let person = {
            name: '刘德华',
            song: function () {
                console.log('我是一只小小鸟');
            },
            eat: function (food = '') {
                console.log('我喜欢吃' + food);
            }
        }
        person.song();
        person.eat('煎饼果子');
    </script>
</body>

</html>